From 07ee4c5ff4c60e8e04eb452e2ef154c47fa118a4 Mon Sep 17 00:00:00 2001
From: Jason Evans <jasone@canonware.com>
Date: Wed, 2 Nov 2016 08:54:07 -0700
Subject: [PATCH] Force no lazy-lock on Windows.

Monitoring thread creation is unimplemented for Windows, which means
lazy-lock cannot function correctly.

This resolves #310.
---
 configure.ac | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 40681d16..4bdd66aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1434,9 +1434,17 @@ fi
 ],
 [enable_lazy_lock=""]
 )
-if test "x$enable_lazy_lock" = "x" -a "x${force_lazy_lock}" = "x1" ; then
-  AC_MSG_RESULT([Forcing lazy-lock to avoid allocator/threading bootstrap issues])
-  enable_lazy_lock="1"
+if test "x${enable_lazy_lock}" = "x" ; then
+  if test "x${force_lazy_lock}" = "x1" ; then
+    AC_MSG_RESULT([Forcing lazy-lock to avoid allocator/threading bootstrap issues])
+    enable_lazy_lock="1"
+  else
+    enable_lazy_lock="0"
+  fi
+fi
+if test "x${enable_lazy_lock}" = "x1" -a "x${abi}" = "xpecoff" ; then
+  AC_MSG_RESULT([Forcing no lazy-lock because thread creation monitoring is unimplemented])
+  enable_lazy_lock="0"
 fi
 if test "x$enable_lazy_lock" = "x1" ; then
   if test "x$abi" != "xpecoff" ; then
@@ -1447,8 +1455,6 @@ if test "x$enable_lazy_lock" = "x1" ; then
       ])
   fi
   AC_DEFINE([JEMALLOC_LAZY_LOCK], [ ])
-else
-  enable_lazy_lock="0"
 fi
 AC_SUBST([enable_lazy_lock])